2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 93Get this manual
MAINTENANCE Check he radiato air passage for clo gs or damage St raighte be nt fi ns with smallfl at blade screw driver and remove insectsmu or other obstructi ns it compressed ai or low pressure aterReplace the rad iator if the air flow is re stricted over more han 20 of the radiat ng surface Inst all the rad iator gri lle